Types And Application Technology Of Leather Antiseptic And Mould Inhibitor

The production of antibacterial materials has become a new industry. More and more attention has been paid to antibacterial agents in the world.

Disinfectant, which kills all the microorganisms (including pathogens and non pathogenic bacteria) in the organism.

Disinfectants kill pathogens.

General disinfectants are effective only for the propagation of bacteria under normal concentrations, but no killing effect on spores.

Bacteriostat, also known as bacteriostatic agent or preservative, can prevent or inhibit microbial growth.

Generally speaking, antibacterial agents or antibacterial materials all have bactericidal or bacteriostatic effects.

Many drugs only have bacteriostatic action at low concentration, and can be bactericidal when the concentration increases or the action time is long.

In the environment where the concentration of metal ions is relatively high, microbial survival is affected by many factors.

1) microbial inoculants are weak in mildew resistance, high in dosage, high in cost and easy to discoloration.

At present, inorganic antibacterial materials are mainly used in textiles, plastics, coatings and ceramics.

The antibacterial mechanism is that the metal element acts as an antibacterial form in its ionic form. When the metal cation exists outside the microbial membrane, it changes the polarization state inside and outside the normal biofilm, and causes new ion concentration to prevent or destroy the pportation of small molecules and macromolecular substances needed by cells to maintain physiology.

2) metal ions that enter cells can also bind to nucleic acids and destroy cell division and reproduction.

There are also photocatalytic antibacterial materials.

N type semiconductor metal oxides, such as Ti02, have higher oxidation activity, stronger stability and no toxicity to human body.

TiO.

Under the irradiation of light, the crystal can completely kill the microorganism in contact with it in a short time. It has the advantages similar to metal ions, which is effective, durable, and has no two pollution.

Its antibacterial mechanism is TiO.

The absorption of free radicals by near ultraviolet light can cause oxidation and degradation of organic matter, including penetrating cell membrane, destroying membrane structure, decomposing bacteria, viruses and cancer cells, and degrading the toxin L2] produced by cells.

Because of TiO.

It can act on organic matter, so its antibacterial spectrum is wider than that of metal ions.

In recent years, with the enhancement of environmental awareness and the rapid improvement of biotechnology research, natural antimicrobial agents have attracted more and more attention.

According to the different sources of natural antimicrobial agents, they can be divided into plant sources, animal sources and microorganism sources.

Its bacteriostatic mechanisms are as follows: secreting antibiotics, participating in the competition of nutrition and living space, inducing host to produce disease resistance.

Microbiologically induced hosts produce defense responses or directly infestate pathogens and inhibit pathogenic bacteria.

The antimicrobial agents of animal origin include amino acids, natural peptides, high molecular carbohydrates and so on. They are rich in resources, and their action mechanism is to destroy the P1 and 4 glycosidic bonds in peptidoglycan of bacterial cell wall.

Chitosan has strong antibacterial activity. Antibacterial mechanisms generally believe that there are two kinds of NHs+: one is one of the chitosan molecules, which is positively charged and adsorbed on the cell surface; the other is through osmosis into the cell, absorbing the anionic substances in the cell, disrupting the normal physiological activities of the cell, thereby killing the bacteria.

Protamine, chicken yolk immunoglobulin, propolis and lysozyme have wide application prospects in natural preservatives.

The water-soluble chitosan made by Liu Yanru overcomes the defect that it is insoluble in water.

But at present, restricted by production, natural antimicrobial agents can not achieve large-scale market production.

The mechanism of action is mainly to interact with the anion on the cell membrane surface of bacteria and mold, or react with sulfhydryl group, destroy the synthesis system of protein and cell membrane, and inhibit the propagation of bacteria and mold.

The synthetic organic antibacterial agent has the advantages of quick effect, mildew proof effect and long lasting efficacy, but it has the disadvantages of high toxicity and poor heat resistance.

The development of organic antibacterial agents has also made great progress in China.

Donghua University has developed an antibacterial agent CTU - I, which is the same type of DC_A700 as the Dow Corning company of the United States. Its antibacterial properties are equivalent to DC5700.

Shanghai Kang post industrial company uses halogenated aromatic compounds and their derivatives as antibacterial agents to produce antibacterial fabrics.

Organosilicon antibacterial agents used for antibacterial and deodorant in fiber products have been extensively studied in Japan and the United States. The products represent Dow Corning's DC_A700, and its trimethoxy silyl can be well bound to fibers, while the quaternary ammonium with eighteen alkyl is bactericidal.

Its safety is good, but the cost is high.

The so-called mildew proof antibacterial agent is the environment that can inhibit the propagation of bacteria and mold, cause the environment difficult to survive, and the effect can continue for a longer time.

Japan began to deodorization and hygienic processing of fiber products in 1965.

However, the raw materials used in leather making are rich in protein, fat and other nutrients, which are very easy to be invaded by microorganisms in the process of preservation.

Although processed leather has increased resistance to microorganisms, mildew will still occur, especially in the leather production process, which attracts a large number of fatliquoring agents produced from natural oils. They are also hotbeds for microbial breeding.

All the above reasons constitute the basic condition of moldy.

Mouldy leather products will appear white, blue, yellow and black colonies or patches. The mold on the surface will develop into leather, which will also affect the wearability, strength and elasticity of leather.

Therefore, mould can cause serious damage to the appearance and internal quality of leather and its products. Mould prevention is very important in leather industry.

There are three kinds of mould inhibitors: inorganic compounds (including chlorine, chlorine dioxide, etc.); organic compounds such as phenols, alcohols, esters, quaternary ammonium salts; natural preservatives, such as deacetylated chitosan extracted from crabs and shrimp shells, and "bamboo beauty" extracted from bamboo.

China used to use sodium pentachlorophenol, ethyl naphthol, sodium arsenite and imported PIE as leather mildew inhibitors.

Domestic research on mould inhibitor is in the ascendant. There are CJ 11, A 26, DSS - II, mildew inhibitor B 200P, mildew inhibitor PM, "Jie Mei" brand leather mould inhibitor, high efficiency mildew proof agent, and applied also have: Jing Xiao Li, Fu Mei Bi, Hao Mei Jing; sterilized Dan, dehydro acetic acid, two thiocyanide, paraben ester, chloro 3 3, 5 one or two cresol vitamin K3, K4, Bai Yin Qing.